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如何使用Linux命令dhclient如何使用Linux命令
dhclient
The
Internet Systems Consortium DHCP Client, dhclient, provides a means for
configuring one or more network interfaces using the Dynamic Host Configuration
Protocol, BOOTP protocol, or if these protocols fail, by statically assigning an
address.
linux
dhclient 的语法
dhclient
[ -p port ] [ -d ] [ -e VAR=value ] [ -q ] [ -1 ] [ -r ] [ -lf lease-file ] [
-pf pid-file ] [ -cf config-file ] [ -sf script-file ] [ -e ENVVAR=value ] [ -s
server ] [ -g relay ] [ -n ] [ -nw ] [ -w ] [ if0 [ ...ifN ] ]
-p port
If the DHCP client should listen and transmit on a port other
than the standard (port 68), the -p flag may used. It should be followed by the
udp port number that dhclient should use. This is mostly useful for debugging
purposes. If a different port is specified for the client to listen on and
transmit on, the client will also use a different destination port - one greater
than the specified destination port.
-s
The DHCP client normally transmits any protocol messages it sends
before acquiring an IP address to, 255.255.255.255, the IP limited broadcast
address. For debugging purposes, it may be useful to have the server transmit
these messages to some other address. This can be specified with the -s flag,
followed by the IP address or domain name of the destination.
-g
For testing purposes, the giaddr field of all packets that the
client sends can be set using the -g flag, followed by the IP address to send.
This is only useful for testing, and should not be expected to work in any
consistent or useful way.
-d
The DHCP client will normally run in the foreground until it has
configured an interface, and then will revert to running in the background. To
run force dhclient to always run as a foreground process, the -d flag should be
specified. This is useful when running the client under a debugger, or when
running it out of inittab on System V systems.
-e
The dhclient daemon creates its own environment when executing
the dhclient-script to do the grunt work of interface configuration. To define
extra environment variables and their values, use the -e flag, followed by the
environment variable name and value assignment, just as one would assign a
variable in a shell. Eg: -e IF_METRIC=1
-r
The client normally doesn't release the current lease as it is
not required by the DHCP protocol. Some cable ISPs require their clients to
notify the server if they wish to release an assigned IP address. The -r flag
explicitly releases the current lease, and once the lease has been released, the
client exits.
-1
The -1 flag cause dhclient to try once to get a lease. If it
fails, dhclient exits with exit code two.
-cf, -lf, -pf, and -sf
The DHCP client normally gets its configuration information from
/etc/dhcp3/dhclient.conf, its lease database from
/var/lib/dhcp3/dhclient.leases, stores its process ID in a file called
/var/run/dhclient.pid, and configures the network interface using
/sbin/dhclient-script To specify different names and/or locations for these
files, use the -cf, -lf, -pf and -sf flags, respectively, followed by the name
of the file. This can be particularly useful if, for example, /var/lib/dhcp3 or
/var/run has not yet been mounted when the DHCP client is started.
-w
The DHCP client normally exits if it isn't able to identify any
network interfaces to configure. On laptop computers and other computers with
hot-swappable I/O buses, it is possible that a broadcast interface may be added
after system startup. The -w flag can be used to cause the client not to exit
when it doesn't find any such interfaces. The omshell (1) program can then be

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